Support Dynamic Spawning

[AntumDeluge]

💡 Describe your idea

A fun feature that many RPGs employ is dynamic spawning. This means the location at which an enemy spawns on a map is not guaranteed. Currently, Stendhal only supports static spawning where we always know where an enemy will spawn. It would give the game a more organic feel were it possible to use dynamic spawning in some cases.

The following should be taken into account:

• Static spawning should remain the primary method, whereas dynamic would likely be less common.
• Dynamic spawning should only be used on maps where enemies cannot spawn where they might be enclosed with collision & unreachable by players.
• Maps that are made up of enclosed or tight & winding areas should likely avoid using dynamic spawning.
• Dynamic spawning should use the same spawn rate as static as defined in creatures XML.
• Dynamic spawning should use a static limit to prevent overpopulation. Spawned instances of the same creature from static spawn points should not count toward the limit.

🔬 Motivation

To add variety & in some cases, prevent players from knowing exactly where a creature will spawn. It may help mitigate some cases with players camping for creatures.

📝 Alternatives

🔭 Additional information